锐钛矿
介孔材料
法拉第效率
材料科学
煅烧
化学工程
水溶液
钛
结晶
电解质
纳米技术
光催化
化学
催化作用
电极
有机化学
冶金
工程类
物理化学
作者
Dongwei Ma,Linyunuo Lai,Carlos Ponce de León,Du Yuan,Jia Pan
标识
DOI:10.1016/j.susmat.2022.e00419
摘要
Mesoporous anatase TiO2 spheres (MATS) are elaborated via microwave-assisted rapid crystallization of hydrous TiO2 colloidal spheres (HTCS) self-template. Tuning the hydrothermal and calcination temperatures allow for textural property-controllable synthesis. The optimal MATS are demonstrated as a promising cathode material of aluminium-ion batteries (AIBs) and show superior rate and capacity performances. Their large surface area and porous structure offer a robust and interconnected scaffold for Al3+ insertion/exertion with higher reversibility. The constructed non-aqueous AIBs with RTILs electrolyte deliver the highest initial capacity of 145.3 mA h g−1 at 0.2C with high Coulombic efficiency of ≈ 96.5%, and a reversible capacity of 78.0 mA h g−1 at 1C can be retained after 200 cycles with high Coulombic efficiency of ≈ 98.6%. Our study on the Al storage mechanism further shows the charge/discharge process involves the extraction/insertion of Al species (Al3+, AlCl4−, Al2Cl7−, etc.) into the TiO2 crystal lattices with the formation of intermediate aluminium titanium oxides (Al2Ti7O15 and Al2TiO5) and non-oxides (Ti(AlCl4)2 and Ti(ClO4)4). The continuous enrichment of the latter during cycling greatly deteriorates the reversibility of AIBs.
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